The Buffington Effects DC Servo Motor Controller will allow you to control a single DC servo motor in one of four modes. Open-loop proportional speed controller mode Hobby servo replacement mode Closed-loop proportional speed controller mode Closed-loop position mode The first mode will allow you to control the speed and direction of the motor in an open-loop fashion. This will be useful for stationary applications where repeatable position is not needed such as varying the speed of a fan. The precision of this mode will be eight bits. This will allow you to have 127 different speeds in either direction. In the second mode of operation you will be able to control the position of the motor using a potentiometer to close the control loop. This will allow you to use a large motor with a sturdy gearbox in the same way that you would use a hobby servo. This will allow you to animate even larger and heavier objects than you currently can using hobby servos. The third mode allows you to command the motor to go at a very specific speeds. This mode will require a more expensive motor that has an encoder attached to it but will allow you to command the motor to go very precise speeds in either direction. This mode will use 16 bit precision. The final mode allows you to control your motor's position with a high amount of accuracy. You will be able to command the motor to turn an exact amount of revolutions and stop at exactly the position that you want. This will be useful for applications like motion controller camera rigs or to control moving platforms. This mode will allow you to position your motor using up to 32 bit precision.